How Did Life Span Theory Create a More Useful Social

How did life span theory create a more useful social work model for understanding human behavior?

A) It focused solely on the intrapsychic processes among the id, ego, and superego.
B) It understood human behavior as pathology rather than a developmental process.
C) It understood human behavior as a product more of persons than their environments.
D) It fit well with the emerging emphasis in social work on social systems theory.